Slide for testing liquids



Oct. l, 1935. F. J. MAW

SLIDE FOR TESTING LIQUIDS Filed July 28, 1934 nventor Frank James Maw: B 2&9 w` (Ittorneg Patented Oct. 1, 1935 UNETED STATES PATENT QFEIQE Frank `laines Maw, ingleside, Port Nelson, Ontario, Canada Application July 28, i934, Serial No. 737,362

9 Claims.

This invention relates to a liquid testing slide of that class which is intended for holding a sample of liquid for the purpose of testing the same, and the invention relates more particularly to a slide for holding a sample of lubricating oil in connection with the oil testers shown and described in United States patents, Numbers 1,949,373 issued on December 19, 1933; and 1,940,772 issued on December 26, 1933, to V. A. Schoenberg.

In the testing of oil or other liquids, a small quantity, and in many cases only a drop of the liquid is placed between two transp-arent pieces of glass or other suitable material, the excess liquid removed therefrom and the slide thus formed placed in a testing device having a strong light which is passed through the thin film or liquid retained between the transparent glasses where the condition of the liquid may be determined.

In the design of a suitable slide for this purpose, means must be provided for receiving a small quantity of the liquid, easily and quicklyv reducing the sample to a predetermined thickness or film and removing the excess liquid.

While the slide herewith described and claimed is primarily intended for use with oil testing de vices, it may be used for holding any liquid and either for testing under a microscope, or the transparent windows may be of a magnifying medium, or their surfaces may be divided by hair lines into small squares, and it is understood that the slide may be used in either a vertical or hori- Zontal position.

The object of the invention is to provide a liquid testing slide of this kind that shall be co-mpact, simple, contain few parts, be easily cleaned and durable in construction.

Another object of the invention is to provide a testing slide having means operated by the closing of the slide, for trapping a predetermined quantity and thickness of the liquid between the transparent lens.

Another object of the invention is to providesuch a simple slide that the operation is reduced to, rst the introduction of the liquid, and second and last the closing of the slide which completes the operation.

With these and other objects in View, my invention consists in certain construction and combination of parts as will hereinafter be fully described and claimed, and further illustrated in the accompanying drawing which forms a part hereof and in which like figures of reference refer to corresponding parts in all of the views, and it is understood that slight changes may be made without departing from the spirit of the invention.

In the drawing:

Figure 1 shows the slide in an open position ready for loading.

Figure 2 is a sectional View taken on the line 2--2 of Figure l.

Figure 3 is a similar sectional View, but with the slide closed.

Figure fi is a sectional View showing a modified form of the device.

Referring to the drawing:

As the device is herewith shown, it comprises the two hinged plates I and II, made from some suitable material such as metal and shown as hinged together as at I2, but which may be detached from cach other if so desired; the plate I i being slightly shorter than the plate It, which is provided with the curved end plate i3 and the handle Ifl, but both the size and the shape of these plates may vary on account of the uses for which they are intended, and the design of testing machine with which they are intended to be used.

rhese plates i il and I I are both formed with a central opening or oriice i6, which will register with each other when the plates Itl and II are superimposed one upon the other in a closed position as shown is Figure 3; `and each of these orices or openings I6 are formed with an undercut annular groove I8 of slightly larger diameter that the diameter of the opening or orifice I6.

As shown in Figures l, 2 and 3, the plate 10 is slightly thicker than the plate II, and above the opening or oriiice It is formed a depression or pocket I5 which communicates with an annular groove il which is formed concentric with, and of a larger diameter than that of the opening or orice ld, and which provides a container for the excess liquid which is forced out by the closing of the two plates.

The plate Ii as shown in Figures l, 2 and 3, is formed with a ring 29 which is slightly raised above the surface of the plate II and is concentric with the opening or orifice it, and this ring 2d is formed with a series of radial ducts 2l, which communicate with the annular groove II when the plates are closed one upon the other.

Within the annular grooves I3 are secured the lenses is and E2, by the cement or other suitable material 23; and these lenses may be of any suitable material such as glass either plain or magnifying, or any transparent material which may be used for this purpose; the lens i9 inthe plate I@ being set slightly below the surface of the plate to form the liquid chamber 2e, while the lens 22 is set ush with the surface of the ring 2d in such a manner as to co-act with the lens i9 when the plates Iil and I i are in a closed position to form the liquid chamber 24 between said lenses i@ and 22, as shown in Figure 3.

In the modied construction shown in Figure 4, the plate II has in place of the annular ring 20, the ducts 25 formed directly in the face of the plate II; the lens I9 being positioned in plate i in the same manner as shown in Figures 2 and 3, while that of the lens 22 located. in the plate l l is set flush with the surface of the plate as this plate li has no raised annular ring.

In the operation of the device, a small quantity of the liquid to be tested, such as oil, is placed upon the surface of the lens iii; the plates li] and l l are then closed one upon the other, and the liquid will be trapped in the liquid chamber formed between the adjacent surfaces of the lenses is and 22, which are spaced apart a predetermined distance to retain the required thickness -or nlm of the liquid, and the excess liquid will by the closing action be forced through the ducts 2l into the annular groove l'l, or in place of this ai -..ular groove il the plate may be formed with a series of holes through which the liquid may pass.

After the test, the slide may be cleaned in any suitable manner, and is again ready for use.`

I-Iaving thus described my invention, what I claim as new and desire to secure by Letters Pat-J ent, is:

l. In a liquid testing container or slide, the combination with two plates adapted to be superimposed one upon the other and each formed with an opening therein, lenses mounted in said openings a predetermined distance from the adjacent faces of the plates to form a chamber for the liquid of a predetermined capacity, a` recess formed adjacent to said liquid chamber and communicating therewith, restricted radial passages between said liquid chamber and said recess for removing the excess liquid from the liquid chamber and maintaining predetermined quantity of the liquid within the chamber.

2. In a liquid testing container or slide, the combination with a pair of plates adapted to be superimposed one upon the other and each fc" :red with an opening therein, lenses mounted in said openings a predetermined distance from Y the faces of the plates to form a liquid chamber predetermined capacity, a recess formed between said plates and communicating with said liquid chamber, restricted radial passages between said liquid chamber and the recess-for the removal of the excess liquid from the liquid chamber aiter the same has been lled to capacity.

3. In a slide for testing liquids, the combination with a pair of flat plates hinged together and adapted to close one upon the other and each formed with an opening in registry with each other, lenses of different thickness mounted within said openings, one lens flush with one plate and the other lens below the surface of the other plate to form a liquid chamber, an annular groove formed in one plate' concentric with the opening therein, and radial ducts formed in the other plate communicating both withV the annular groove and the liquid chamber when the plates are closed for conducting the excess liquid from the liquid chamber to the annular groove;

4. In a slide for holding liquids to be tested, the combination with a pair of flat plates hinged together and adapted to be closed one upon the other, each of said plates having an opening formed therein and in registry with each other .when the plates are closed, lenses of diderent thickness mounted in said openings, one lens being liush with the surface of one plate and the other lens being below the surface of the other plate to form a chamber for the liquid, one of said platesY formed with an annular groove in the surface thereof and concentric with the lens, the

other plate formed with a series of radial ducts 5 in its surface which when the plates are closed communicate both with the chamber for the liquid and the annular groove.

5. In a slide for holding liquids to be tested, the combination with a pair of flat plates hinged together and adapted to be closed one upon the other, each of said plates formed with an opening in registry with each other when the plates are closed, lenses mounted in said openings, one lens flush with the surface of one plate and the other lens below the surface of the other plate to form a liquid chamber, one of said plates formed with an annular groove concentric with the openings, an annular ring formed on the other plate concentric with the annular groove and formed with a series of radial ducts providing communication between the liquid chamber and the annular groove when the plates are closed.

6. In a slide for holding liquids to be tested, the combination with two plates adapted to be superimposed one above the other and each formed with an opening therein, of lenses mounted in said openings, one lens being on the same plane as one plate and the other lens being below the plane of the other plate to space said lenses apart when the plates are superimposed to form a liquidA chamber, and means for receiving and removing the excess liquid from said liquid champer comprising radial ducts formed in one plate and a well formed in the other of said plates.

7. In a slide for holding oil to be tested, the combination with two plates adapted to be superimposed one upon the other and both formed with registering openings therein, lenses mounted in said openings, one lens on a plane with the surface of one plate and the other lens below the surface plane of the other plate to form an oil chamber, and means for leading the excess oil from the oil chamber comprising radial ducts Vformed in one plate and an annular well formed Y in the other of said plates.

8. In a liquid testing device or slide, the combination with Vtwo plates adapted to be superimposed one above the other and each formed with an opening therein, lenses mounted in said openings one ush with the surface of one plate and the other below the surface of the other plate to space said lenses apart forming an oil chamber, and means Vfor receiving and removing the excess oil from the oil chamber comprising radial ducts formed in one plate and an annular well formed in the Yother of said plates.

9. In a liquid testing container or slide, the combination with two platesV adapted to be superimposed one upon the other and Veach formed with an opening therein, lenses of different thickness mounted in said openings, one lens on a plane with the surface of one plate and the other lens below the plane of the surface of the other plate placing said lenses a predetermined distance apart when the plates are closed to form a liquid chamber of a predetermined capacity, and an annular recess formed in one plate and communicating with said liquid chamber.

FRANK JAMES MAW. 

